In situ thermal processing of coal formation with a selected hydrogen content and/or selected H/C ratio
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United States of America Patent
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Nov 23, 2004
Grant Date -
Jan 30, 2003
app pub date -
Apr 24, 2001
filing date -
Apr 24, 2000
priority date (Note) -
Expired
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Abstract
A coal formation may be treated using an in situ thermal process. A mixture of hydrocarbons, H.sub.2, and/or other formation fluids may be produced from the formation. Heat may be applied to the formation to raise a temperature of a portion of the formation to a pyrolysis temperature. A formation may be selected that will produce a relatively large amount of condensable hydrocarbons and/or a relatively large amount of non-condensable hydrocarbons. Hydrocarbons within the formation may have a relatively high initial elemental hydrogen weight percentage. Hydrocarbons within the formation may have an initial hydrocarbon to carbon ratio within a desired range.
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